The Vandals (4-4) erased an early 15-point deficit and climbed within two on a Dean 3-pointer at the 7:59 mark. After a Brynton Lemar layup and three-point play by Igor Nujic, Idaho surged on a 16-2 run, sparked by a trio of 3-pointers from Dean to lead 78-71.
UC Davis (3-5) cut the deficit to two on two jumpers by Corey Hawkins, but Hawkins couldn't connect on a potential game-tying jumper with eight seconds left. Dean sank two late free throws to seal the win.
Hill and Dean finished a combined 12 of 16 from beyond the arc. Stephen Madison added 15 points and 16 rebounds.
Hawkins led the Aggies with 18 points and Josh Ritchart added 16 with nine boards.